CN214533132U - Crankcase ventilation system - Google Patents
Crankcase ventilation system Download PDFInfo
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- CN214533132U CN214533132U CN202022892651.XU CN202022892651U CN214533132U CN 214533132 U CN214533132 U CN 214533132U CN 202022892651 U CN202022892651 U CN 202022892651U CN 214533132 U CN214533132 U CN 214533132U
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Abstract
The utility model relates to a crankcase field discloses a crankcase ventilation system, include: a housing of an engine having a separation chamber; the oil-gas separation device comprises a plurality of cylinder bodies which are arranged on the machine body along a first direction, wherein each cylinder body is provided with a first oil-gas inlet communicated with the separation cavity; selecting any adjacent cylinder body, and respectively arranging oil return holes on the two selected adjacent cylinder bodies; the other unselected cylinder bodies are provided with second oil-gas inlets communicated with the separation cavity; and the air outlet is arranged opposite to the oil return hole along a second direction, and the first direction is vertical to the second direction. For improving the NVH performance of the vehicle.
Description
Technical Field
The utility model relates to a crankcase technical field, in particular to crankcase ventilation system.
Background
The NVH problem of vehicles is one of the concerns of various large vehicle manufacturing enterprises and component enterprises in the international automotive industry. Statistics show that 1/3 failure problem of the whole automobile is related to NVH problem of the automobile, and nearly 20% of research and development cost of each large company is consumed for solving the NVH problem of the automobile. NVH is an english abbreviation for Noise, Vibration and Harshness (Noise, Vibration, Harshness). This is a comprehensive measure of the quality of a vehicle's manufacture and gives the vehicle user the most immediate and surface experience.
Therefore, how to improve the NVH performance of the vehicle becomes a technical problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a crankcase ventilation system for improve the NVH performance of vehicle.
In order to achieve the above purpose, the utility model provides the following technical scheme:
a crankcase ventilation system comprising: a housing of an engine having a separation chamber;
the oil-gas separation device comprises a plurality of cylinder bodies which are arranged on the machine body along a first direction, wherein each cylinder body is provided with a first oil-gas inlet communicated with the separation cavity;
selecting any adjacent cylinder body, and respectively arranging oil return holes on the two selected adjacent cylinder bodies; the other unselected cylinder bodies are provided with second oil-gas inlets communicated with the separation cavity;
and the air outlet is arranged opposite to the oil return hole along a second direction, and the first direction is vertical to the second direction.
The rigidity of the engine body is enhanced by arranging a cast positive displacement oil-gas separation cavity which is communicated with the front and the back in the middle area of the main thrust side of the engine body, the front and back communication direction is a first direction, and the separation cavity is communicated with each cylinder body, so that the pressure balance of each cylinder body is realized; oil gas enters the casting separation cavity from the oil gas inlet, the flow speed of oil gas in the separation cavity is reduced, oil drops in the oil gas are settled and flow out from the oil return hole, the oil is prevented from being accumulated, and gas enters the oil-gas separator from the gas outlet, so that the NVH performance is improved.
Optionally, the total area S of the first and second hydrocarbon inlets2＝N1×S1+2×S1(ii) a Wherein S is1The cross-sectional areas of the first and second hydrocarbon inlets; n is a radical of1The number of the first oil gas inlets is;
V1＝L/S2(ii) a Wherein, V1The flow rates of the first and second hydrocarbon inlets;
and L is the air leakage of the engine.
Optionally, the hydrocarbon flow rate of the first and second hydrocarbon inlets is less than 1 m/s.
Optionally, the flow velocity V of the oil and gas in the separation chamber2＝L/S3(ii) a Wherein, the S3Is the cross-sectional area of the separation chamber.
Optionally, the oil and gas flow velocity in the separation cavity is less than 0.5 m/s.
Optionally, the method further comprises: and the flow dividing partition plate is arranged on one side of the air outlet close to the cylinder body.
Optionally, through holes are provided in the main bearing walls between the cylinders for venting between the cylinders and reducing the weight of the cylinders.
Optionally, the number of the cylinders arranged in the first direction on the machine body is six.
Optionally, the number of the cylinder bodies arranged on the machine body along the first direction is four.
Drawings
Fig. 1 is a front view of an engine body with a separation chamber according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;
fig. 4 is an external structural schematic diagram of a separation chamber according to an embodiment of the present invention.
Icon: 100-a separation chamber; 200-cylinder body; 300-a first hydrocarbon inlet; 400-oil return hole; 500-a second oil and gas inlet; 600-gas outlet; 700-a splitter plate; 800-through hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
During operation of the engine, high-pressure combustible mixture and burned gas in the combustion chamber leak into the crankcase through a gap between the piston group and the cylinder to a greater or lesser extent, resulting in blow-by. The blow-by gas is composed of unburned fuel gas, water vapor, exhaust gas and the like, which can dilute the engine oil, reduce the service performance of the engine oil and accelerate the oxidation and deterioration of the engine oil. The water and the air are condensed in the engine oil to form oil sludge and block an oil way; acid gases in the exhaust gas are mixed into the lubrication system, which can cause corrosion and accelerated wear of engine parts; blow-by also causes the crankcase pressure to be too high and the crankcase seal to be broken, allowing oil to leak and run off.
Crankcase ventilation must be implemented to prevent excessive crankcase pressure, extend engine oil life, reduce wear and corrosion of parts, and prevent engine oil leakage. In addition, crankcase ventilation system designs must also be implemented during automotive engine design to meet increasingly stringent emissions requirements and to improve economy.
As shown in fig. 1 to 4, an embodiment of the present invention provides a crankcase ventilation system, including: the engine block with the separation chamber 100;
a plurality of cylinder blocks 200 arranged on the machine body along a first direction, wherein each cylinder block 200 is provided with a first oil-gas inlet 300 communicated with the separation cavity 100;
selecting any adjacent cylinder 200 and respectively arranging oil return holes 400 on the two selected adjacent cylinders 200; the other unselected cylinder bodies 200 are provided with second oil gas inlets 500 communicated with the separation cavity 100;
and the air outlet 600 is arranged opposite to the oil return hole 400 along a second direction, and the first direction is perpendicular to the second direction.
The casting positive displacement oil-gas separation cavity 100 which is through from front to back is arranged in the middle area of the main thrust side of the machine body, so that the rigidity of the machine body is enhanced, the front-back through direction is a first direction, the separation cavity 100 is communicated with each cylinder body 200, and the pressure balance of each cylinder body 200 is realized; oil gas enters the casting separation cavity 100 from the oil gas inlet, the flow speed of oil gas in the separation cavity 100 is reduced, oil drops in the oil gas are settled and flow out from the oil return hole 400, the oil is prevented from being accumulated, and gas enters the oil-gas separator from the gas outlet 600, so that the NVH performance is improved.
Optionally, the total area S of the first and second hydrocarbon inlets 300, 5002＝N1×S1+2×S1(ii) a Wherein S is1The cross-sectional areas of the first and second hydrocarbon inlets 300, 500; n is a radical of1The number of the first oil gas inlets 300;
V1＝L/S2(ii) a Wherein, V1The flow rate of the oil gas at the first oil gas inlet 300 and the second oil gas inlet 500;
and L is the air leakage of the engine.
Specifically, the oil and gas flow rates of the first oil and gas inlet 300 and the second oil and gas inlet 500 are less than 1 m/s.
To ensure the effect of pre-separation by settling oil droplets, the flow velocity V of the oil in the separation chamber 1002＝L/S3(ii) a Wherein S is3The cross-sectional area of the separation chamber 100.
Specifically, the flow rate of the oil gas in the separation chamber 100 is less than 0.5 m/s.
Optionally, the method further comprises: and a flow dividing partition 700 provided at a side of the air outlet 600 adjacent to the cylinder 200. The splitter vane 700 here redirects the air flow to further reduce oil droplets in the air flow.
And through holes 800 are provided on the main bearing wall between the cylinder blocks 200, the through holes 800 being used for ventilation between the cylinder blocks 200 and weight reduction of the cylinder blocks 200.
Four inter-cylinder through holes 800 are formed in each inter-cylinder main bearing wall, so that ventilation and air communication between the cylinder blocks 200 are realized, pressure balance of the crankcase of each cylinder block 200 is kept, and the weight of the cylinder block 200 is reduced.
The embodiment of the utility model provides a cylinder block 200 of engine among crankcase ventilation system can have multiple selection, specifically explains below:
in the first mode, six cylinder blocks 200 are arranged on the machine body along the first direction.
Specifically, referring to fig. 1, six cylinder bodies 200 arranged along a first direction are respectively a first cylinder, a second cylinder, a third cylinder, a fourth cylinder, a fifth cylinder and a sixth cylinder, specifically, the first cylinder, the fourth cylinder, the fifth cylinder and the sixth cylinder are respectively provided with two oil gas inlets, and the second cylinder and the third cylinder are respectively provided with one oil gas inlet; the air outlet 600 is set between the first cylinder and the second cylinder, the air outlet 600 is set between the second cylinder and the third cylinder, the air outlet 600 is set between the third cylinder and the fourth cylinder, the air outlet 600 is set between the fourth cylinder and the fifth cylinder, the air outlet 600 is set between the fifth cylinder and the sixth cylinder, the air outlet 600 is set between the second cylinder and the third cylinder, a flow dividing partition plate 700 is arranged at the lower part of the air outlet 600, the air flow direction is changed, and oil drops in the air flow are further reduced. The lower part of the gas outlet 600 is not provided with an oil gas inlet, so that the influence of the over-small distance between the inlet and the gas outlet 600 on the pre-separation effect is prevented. However, two oil return holes 400 are formed at the lower portion of the air outlet 600 to prevent the accumulation of the engine oil.
In the second mode, four cylinder blocks 200 are arranged on the machine body along the first direction.
The arrangement and distribution of four cylinders 200 are the same as those of six cylinders 200, and will not be described herein.
It will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A crankcase ventilation system, comprising: a housing of an engine having a separation chamber;
the oil-gas separation device comprises a plurality of cylinder bodies which are arranged on the machine body along a first direction, wherein each cylinder body is provided with a first oil-gas inlet communicated with the separation cavity;
selecting any adjacent cylinder body, and respectively arranging oil return holes on the two selected adjacent cylinder bodies; the other unselected cylinder bodies are provided with second oil-gas inlets communicated with the separation cavity;
and the air outlet is arranged opposite to the oil return hole along a second direction, and the first direction is vertical to the second direction.
2. The crankcase ventilation system of claim 1, wherein a total area S of the first and second oil and gas inlets2＝N1×S1+2×S1(ii) a Wherein S is1The cross-sectional areas of the first and second hydrocarbon inlets; n is a radical of1The number of the first oil gas inlets is;
V1＝L/S2(ii) a Wherein, V1The flow rates of the first and second hydrocarbon inlets;
and L is the air leakage of the engine.
3. The crankcase ventilation system of claim 2, wherein the first and second oil and gas inlet flow rates are less than 1 m/s.
4. The crankcase ventilation system of claim 2, wherein the flow velocity V of the oil gas in the separation chamber2＝L/S3(ii) a Wherein, the S3Is the cross-sectional area of the separation chamber.
5. The crankcase ventilation system of claim 4, wherein a gas flow velocity within the separation chamber is less than 0.5 m/s.
6. The crankcase ventilation system of claim 1, further comprising: and the flow dividing partition plate is arranged on one side of the air outlet close to the cylinder body.
7. The crankcase ventilation system according to claim 1, wherein through holes are provided in the main bearing walls between the cylinders for ventilation between the cylinders and for reducing the weight of the cylinders.
8. The crankcase ventilation system of claim 1, wherein the number of cylinders arranged in the first direction in the housing is six.
9. The crankcase ventilation system of claim 1, wherein the number of cylinders arranged in the housing in the first direction is four.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022892651.XU CN214533132U (en) | 2020-12-02 | 2020-12-02 | Crankcase ventilation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022892651.XU CN214533132U (en) | 2020-12-02 | 2020-12-02 | Crankcase ventilation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214533132U true CN214533132U (en) | 2021-10-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022892651.XU Active CN214533132U (en) | 2020-12-02 | 2020-12-02 | Crankcase ventilation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214533132U (en) |
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2020
- 2020-12-02 CN CN202022892651.XU patent/CN214533132U/en active Active
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